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posix_setsid — Creates a new session and sets its process group ID (POSIX.1, 4.3.2)


int posix_setsid(void)


The session ID of the new session; FALSE if unsupported or if the calling process is already a process group leader.


This function creates a new session and makes the current process its group leader. The process group and session IDs of the calling process will be set to its process ID.


PHP 3.0.13+, PHP 4.0b4+


Example 1088. Creating a new session

if (!$sessid = posix_setsid()) {
    echo "Could not create the new session.\n";
} else {
    echo "New session successfully created with ID '$sessid'.\n";

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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